I'm unable to send or receive mail after upgrading to OSX 10.5. The connection doctor shows no problems with the connection for the account, so I can't understand what the problem is. If I try to send/receive mail then it just looks like it's doing it but never finishes and never gives an error message.

The other issue with Mail is that I sometimes have to force-quit.

Other problems I have noticed after upgrade is that the ethernet port won't recognise an internet connection (wireless is OK).